Question

请使用ID（学期）建立链接

这是我的数据库：

Courses: id , title , pdf_file , extension , description , matieres_id and timetables
Matieres: id , matiere , semester_id and timetables
Semesters: id , semester, matieres_id and timetables

route / web.php

Route::get('/lms/semestre', 'HomeController@semestres');
Route::get('/lms/', 'HomeController@lms');
Route::get('/lms/matieres/{id}', 'HomeController@matieres');
Route::get('/lms/course/{id}', 'HomeController@course');
Route::get('/lms/courses', 'HomeController@courses');

Course.php（模型）

class Course extends Model
{
    use SoftDeletes;

    protected $table = 'courses';
    protected $fillable = ['id'];

    public function matiere()
    {
        return $this->belongsTo(\App\Matiere::class);
    }
}

Matiere.php（模型）

class Matiere extends Model
{
    protected $table = 'matieres';
    protected $fillable = ['id'];
    public function semestre()
    {
        return $this->belongsTo(\App\Semestre::class);
    }
}

Semestre.php（模型）

class Semestre extends Model
{
    protected $table = 'semestres';
    protected $fillable = ['id'];
    public function matiere()
    {
        return $this->belongsTo(\App\Matiere::class);
    }
}

我的问题是如何使用/lms/courses/{semester_id}来创建网址course->matiere_id->semesters并显示页面，其中是课程列表。这对我来说非常复杂，我不想在课程表中创建列semester_id。

Answer 1

尝试这个。注意：确保在CourseDB之前先创建SemesterDB

数据库：

course_db：

Schema::create('courses', function (Blueprint $table) {
        ...
    });

semester_db：

Schema::create('semesters', function (Blueprint $table) {
...
$table->unsignedBigInteger('course_id');
...

$table->foreign('course_id')->references('id')->on('courses')->onDelete('cascade');
})

型号：

course_model：

protected $guarded = [];

public function semester() {
return $this->hasOne(Semester::class);
}

学期模式：

protected $guarded = [];

public function course() {
return $this->belongsTo(Course::class);
}

控制器：

App\Course;

public function index() {
$courses = Course::all();
dd($courses->semester);
}

如何使用关系获取数据

1 个答案: